Also use bash for accentor docker script

shells/accentor-api.nix

@@ -10,7 +10,7 @@ pkgs.mkShell {
     zlib
     (
       pkgs.writeScriptBin "start-db" ''
-        #!/${pkgs.zsh}/bin/zsh
+        #!/${pkgs.bash}/bin/bash
 
         trap "systemd-run --user --no-block docker stop accentor-db" 0
         docker run -d --name accentor-db -p 5432:5432 --rm -v accentor-db-data:/var/lib/postgresql/data -e POSTGRES_PASSWORD=accentor postgres:latest